package com.wang.study.filter;

import com.alibaba.fastjson.JSONObject;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter("/cart.do")
public class loginFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        Object loginUser = request.getSession().getAttribute("loginUser");
        if(null == loginUser){
            //该请求是ajax请求
            if(request.getHeader("X-Requested-With").equals("XMLHttpRequest")){
                response.getWriter().write(new JSONObject().toJSONString(false));
            }else{
                //普通的请求
                response.sendRedirect("/commons/login.jsp");
            }
        }else{
            filterChain.doFilter(request,response);
        }
    }
    @Override
    public void destroy() {

    }
}
